Fluorine-doped carbon covered lithium iron phosphate, and preparation method and application thereof

A carbon-coated lithium iron phosphate and lithium iron phosphate technology, which is applied in the field of energy storage materials and electrochemistry, can solve the problem of low specific capacity, poor high-rate performance, pure-phase lithium iron phosphate electronic conductivity, and lithium ion diffusion rate. Low-level problems, to achieve the effect of improved material properties, good repeatability and stability, and simple preparation methods

Inactive Publication Date: 2016-12-07
CHENGDU UNIV
View PDF3 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own crystal structure, the electronic conductivity and lithium ion diffusion rate of pure-phase lithium iron phosphate are very low, resulting in

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fluorine-doped carbon covered lithium iron phosphate, and preparation method and application thereof
  • Fluorine-doped carbon covered lithium iron phosphate, and preparation method and application thereof
  • Fluorine-doped carbon covered lithium iron phosphate, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] (1) Preparation of nano-scale pure phase lithium iron phosphate by hydrothermal method

[0034] A. Measure lithium hydroxide monohydrate (LiOH·H 2 O) 63g (1.5mol), phosphoric acid (H 3 PO 4 )49g (0.5mol), ferrous sulfate heptahydrate (FeSO 4 ·7H 2 (0) 139g (0.5mol), ethylene glycol 4L and ascorbic acid 28g (0.16mol);

[0035] B. Lithium hydroxide monohydrate is added to the mixed solution of phosphoric acid and ethylene glycol, after stirring for 30 minutes, add ascorbic acid and ferrous sulfate heptahydrate, stir for another 30 minutes, and then pour into the reaction kettle;

[0036] C. Put the reactor into an oven and heat it at 150°C for 10h;

[0037] D. Take out the sample, cool it down to room temperature naturally, then pour it into a test tube and centrifuge at 9000r / min for 10min;

[0038] E. Pour off the upper layer solution in the test tube, wash the sample with ethanol solution and deionized water in turn (3 times each), centrifuge ...

Example Embodiment

[0048] Example 2

[0049] (1) Preparation of nano-scale pure phase lithium iron phosphate by hydrothermal method

[0050] A. Measure lithium chloride 63g (1.5mol), phosphoric acid 49g (0.5mol), ferrous chloride 139g (0.5mol), water 4L and ascorbic acid 28g (0.16mol);

[0051] B. Add lithium chloride to the solution of phosphoric acid and water, add ascorbic acid and ferrous chloride after stirring for 30min, stir for another 30min, then pour into the reaction kettle;

[0052] C. Put the reactor into an oven and heat at 180°C for 5 hours;

[0053] D. Take out the sample, cool it to room temperature naturally, then pour it into a test tube and centrifuge at 8000r / min for 20min;

[0054] E. Pour off the upper layer solution in the test tube, wash the sample with ethanol solution and deionized water in turn (3 times each), centrifuge until the upper layer solution is clear, and then put it in a vacuum oven for drying at 60°C to obtain nano-scale pure phase Lithium iron phosphat...

Example Embodiment

[0058] Example 3

[0059] (1) Preparation of nano-scale pure phase lithium iron phosphate by hydrothermal method

[0060] A. Measure lithium chloride 1.27kg, phosphoric acid 0.98kg, ferrous chloride tetrahydrate 1.99kg, glycerol 0.6L and ascorbic acid 0.14kg;

[0061] B. Lithium chloride is added in the mixed solution of phosphoric acid and glycerol, after stirring for 30min, add ascorbic acid and ferrous chloride, stir for another 30min, then pour into the reactor;

[0062] C. Put the reactor into an oven and heat it at 190°C for 4 hours;

[0063] D. Take out the sample, cool it to room temperature naturally, then pour it into a test tube and centrifuge at 8000r / min for 20min;

[0064] E. Pour off the upper layer solution in the test tube, wash the sample with ethanol solution and deionized water in turn (3 times each), centrifuge until the upper layer solution is clear, and then put it in a vacuum oven for drying at 60°C to obtain nano-scale pure phase Lithium iron phosph...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Discharge specific capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a fluorine-doped carbon coated lithium iron phosphate, and preparation method and application thereof. The method comprises the steps of firstly mixing and grinding prepared pure lithium iron phosphate with organic matters including F for several hours by using an organic solvent and then drying in a vacuum chamber, and calcinating at high temperatures for several hours in the atmosphere of inert gas and thus obtaining the fluorine-doped carbon coated lithium iron phosphate. The fluorine-doped carbon coated lithium iron phosphate prepared by using the method can be significantly improved in electrochemical performance, and can reach a specific discharge capacity of 150mAh/g.

Description

technical field [0001] The invention relates to a fluorine-doped carbon-coated lithium iron phosphate and a preparation method and application thereof, which belong to the technical field of energy storage materials and electrochemistry. Background technique [0002] As the most promising cathode material for lithium-ion batteries, lithium iron phosphate has many advantages: low price, high theoretical capacity, long cycle life, excellent cycle performance, good structural thermal stability during lithium ion deintercalation, etc., is the most promising It is hoped to be applied to high-power lithium-ion battery cathode materials for high-power electrical appliances and hybrid vehicles. However, due to the limitation of its own crystal structure, the electronic conductivity and lithium ion diffusion rate of pure-phase lithium iron phosphate are very low, resulting in low actual specific capacity and poor high-rate performance, which greatly limits the application of this ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M4/58H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 刘文龙张崟李婧王卫
Owner CHENGDU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap